大约有 6,000 项符合查询结果（耗时：0.0229秒） [XML]
Fastest way to determine if record exists
...sting point. I'm not sure if an Index exists on this field, and my newbish SQL doesn't know how to find out. I am working with this DB from Java via JDBC and the database is remotely located in a colo somewhere. I've only been provided a "database summary" which just details which fields exist in ea...
Why do loggers recommend using a logger per class?
... code.
A good example where this is not the best approach, is Hibernate's SQL logs. There is a shared logger named "Hibernate.SQL" or something like that, where a number of different classes write raw SQL out to a single logger category.
...
MySQL: Order by field size/length
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@mastazi according to MySQL documentation: OCTET_LENGTH() is a synonym for LENGTH().
– Heitor
Oct 1 '17 at 5:35
...
Call a stored procedure with parameter in c#
...operly:
private void button1_Click(object sender, EventArgs e) {
using (SqlConnection con = new SqlConnection(dc.Con)) {
using (SqlCommand cmd = new SqlCommand("sp_Add_contact", con)) {
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@FirstName", SqlDbType.VarC...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...些多路复用的模式中，异步阻塞/非阻塞模式的扩展性和性能最好。
引入阻塞/非阻塞,、同步/异步比喻很形象的一段话：
有A，B，C，D四个人在钓鱼：
A用的是最老式的鱼竿，所以呢，得一直守着，等到鱼上钩了再拉杆；
B的...
On delete cascade with doctrine2
...;br />\n";
}
If you now do
# doctrine orm:schema-tool:create --dump-sql
you will see that the same SQL will be generated as in the first, raw-SQL example
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Is there any connection string parser in C#?
...e base class from which the
strongly typed connection string
builders (SqlConnectionStringBuilder,
OleDbConnectionStringBuilder, and so
on) derive. The connection string
builders let developers
programmatically create syntactically
correct connection strings, and parse
and rebuild ex...
What is the purpose of AsQueryable()?
...yable() is explained in Using AsQueryable With Linq To Objects And Linq To SQL. In particular, the article states,
This offers an excellent benefits in real word scenarios where you have certain methods on an entity that return an IQueryable of T and some methods return List. But then you have ...
Laravel Migration Change to Make a Column Nullable
...ifying columns, so you'll need use another technique such as writing a raw SQL command. For example:
// getting Laravel App Instance
$app = app();
// getting laravel main version
$laravelVer = explode('.',$app::VERSION);
switch ($laravelVer[0]) {
// Laravel 4
case('4'):
DB::stat...
error, string or binary data would be truncated when trying to insert
...
Thanks. Mine was because the sql column in tableA is varchar(100). It also insert to another table, in which, the column is varchar(50).
– Hnin Htet Htet Aung
Jun 5 '17 at 7:39
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